Weft detector for looms



Nov. 29, 1927.

. A. P. PAINE wEFT DETECTOR Fon Loous Filed JulyB. 1926 Patented Nov.29, 1927.

STA TES ,PATENT o1-1.11cr..`

'A'.BTI-IUR P.. PAINE, OF IGR/CESTER', MASSACHUSETTS, ASSIGNOR T0CROMPTCN @a KNOWLES'LOOM WORKS, OESWORCESTER, MASSACHUSETTS, ACORPORATION OIE' MASSACHUSETTS.

-Wnrrnnrncron non Looms.

[Application inea July 2, 192s. sanar No. 120,195.

v4This;*invention relates to improvementsin went;detectors fory loomsand` it is the principal object-of the' invention to provide a detectorieryv light in its action and exerting very little; pressure on theyarn.

Vtitli-the introduction of fine yarns, such asrrayomit` hasbeennecessary to develop weftf detectors which: exert very littlepressure'because' of thefact that a bobbin of line' yarn will remainactive for such a. lengthof timeA that the ordinary weft detector will'fray or abrade the yarn before the latter has vbeen woven 0H the bobbinand itfis: accordingly an important object of my invention to 'provide aweft detector formed preferably of light wire-yarnengagingiportionsfwhiohare heldy in position by a small spring; Y

Weft Vdetectorsof the typev shown in patent tot Ryon. No; 972,722 have`gone into ,very extensive;- use and have been foundy very satisfactory,said. detectors beingof the socalled .doubley Contact type and having ayarn penetrating wedge-shaped detector which cooperates with anangularly moving notchedt or tnothedV yarn impinging member. Suchdetectors are commonly made with at leastl two-springsandv it is a.further object of my inventionv to .employ the same principleaasthatemployed in'v the Ryonl detector withgtheuse ofal singlefspring. f

VVheni detectors areplaced on the maga'- zine. end; of: automa-tic boxlooms it is neccssaryy toY withdraw the same en transferring beatsanditiis.- acoordinglya further objectk ofmy invention to: provide forwithdrawing both of the-yarn enga-ging 'detectingmembersz'on.transferring-beats` by acting on one ofi saidz detectors,therev being an interengaging connection between both detectors-so thatthey will be: withdrawn together without giving, an indication.

In automatic box looms` the control for thevmagazine is usually veryclose to the detector, masking it possible toJ have a short connectionbetweengt-he4 weft detector and the magazine and it is according-lyfurther object. of'my-invention to provide a very simple and lightdevice for' communicating indication of weft exhaustion from thedetector tothe controller which. i'scontrolled by' the laterally movabledetector and positioned? by the same spring which controls the'`detectors:

` With these and other objects in view which will appear as thedescription proceeds,^1ny invention resides in thecombination andarrangement of parts hereinafter described and set forth inv the*claims.

In the accompanying drawings wherein I have shown a convenientembodiment of, my invention,`

Fig. l is a top plan view of my detector showing associated partsof thereplenishing mechanlsm, parts of whichare in section,

. Fig. 2 is a front elevation of the detector taken in the direction ofarrow 2, Fig.1, parts `being broken away,

Fig. 3 is a view similar .to a portion of lFlg. l with the cap of` the'detector removed .showing the parts yinthe position. they assume on theforwardk stroke ofthe lay when 1n dcontact with a suiiicient supply ofweft, an

Figs. 4 and 5 are vertical sections on lines 4 4 vand 5-5, respectively,of 3.

Referring to thevdrawings it will be seen thatl have provided .a loomframe 10 to which is bolted the foot 11 ofa weft replenishing mechanism12 provided with. a hub 13 through which extends stud 1-1'vsecnredthereto byk a setvscrew 15. Pivotally mounted on the stud is. atransferrer arm 16V having depending feet .17 between which extends apin 18 for the transferrer latchy (not shown). l v

A bracket 19 is bolted to theloom frame and. has slidably mountedtherein for vertical movementa block 2O on which is pivote'd aoatingactuator lever 2l the inner end of. which is pivotally connected to .an

upwardly extending rod 22. whichv is ,'connectedy to theweftreplenishingmechanism block 20 will be given.- al downward movementand if sufficient yarn vis present the outer end will move downwardlyfreely in slot 24 leaving the connector 22'unmoved, but if insuiiicientyarnv is present the outer end of the actuatorV lever will beinterrupted in its descent to'cause a downward moyementof the connector22, the 'eiectof which will be to indicate for a change of operation inthe loom. Thematter thus far described 1s of common construction and maybe as set forth in the aforesaid patent and also inV vided with a lug33. Said bed is further provided with guiding and bearing surfaces 34and the rear portion of the bed is further provided with a pin 35.

Thelaterally moving yarn impinging detector'is formed preferably of a.single piece of wire 36 having the rear surface thereof notched and bentto extend parallel to the bobbin as at 37, the forward end of the wire36 being bent as at 38 to rest 0n one of the guides 34 and thenextending across the bed to `rest on the other guide as at 39. Saidportion 39 normally cooperates with the lug 33 which serves as a pivotabout which the detector may move. Said wire 36 isprovided with a crimpy40 to receive the forward end of a very light tension spring 41 the rearend of which is secured to the lug or projection 35. A boss 42preferably cast integral with the bed engages the forward part .of thewire 36 as indicated in Fig. 1, said lug and boss 33 cooperating withthe spring 41 to position the yarn engaging rear end 37.

The yarn penetrating detector is indicated at 43 and has a rear pointedend 44 which extends slightly behind the teeth of the detector 36, theforward portion of the detector 43 bridging the wire 36 as at 45 andex'- tending to the right to be supported on the. right hand guide 34. Asecond boss 46 cast'on the bed guides the detector 43 to preventmovement thereof to the left, lug 42 acting to prevent movement to theright. A rib 47 on the cap 31 engages the top of the bent part of wire43 to prevent upward movement thereof. The wire 36 is extended forwardlyof the bend 39 and downwardly .as at 48 as shown in Figs. 3 and 5, andto the right of the left guide 34. A withdrawing link 49 passes behindthe end 48 of detector 36 and has portions resting on the` guides 34.Said link 49 is guided in the front wall of the bed 30 and is offset tolie in front of pin 18. Said end 48 lies between the pivot lug 33 andthe spring 41 so .that

when being withdrawn the detector 36 willy not move angularly but willmove forwardly with a right line or parallel motion.

The controller' for the actuator lever 19 is preferably formed of asingle piece of bent wire indicated at 50 and has a rearwardly extendingportion bent down and lunder the detector 36 and up on the opposite sidethereof as indicated in Fig. 4 at 51. The intermediate portion of thecontroller is coiled as at 52 and extends around a pivot forming screw53 secured in the cap 31 land the for ward portion of said controller`is ext-ended to the left as indicated in Fig. 1 and is bent rearwardlyas at 54 to be guided on aV shelf 55 of the horn 23. f

- Under normal conditions the spring 41 will hold the angularly movingdetector 36 inthe position indicated in Fig. 1 in fullvv lines andinasmuch as the detector 43 bridges a portion of the angularly movingdetector the former will also be' properly positioned with respect tothe bobbin, this result being accomplished by the single spring 41. Solong as there is sufficient yarnpresent for continued weaving thewedge-shaped member 44 will enter the yarn a sufcient dis-v tance topermit the teeth on the detector 36 also to enter the yarn to restrain`lateral movement thereof, and as the lay continues to move forwardlythe b'obbin B will move the detector from the position shown in Fig. 1to that shown in Fig. 3, the curved part 39 moving away from vthelug orboss-33 and the end 54 of the controller remaining out of the path ofthe actuator lever 21.-

Vhen insufficient yarn for continued weaving is present, however,thewedge 44 will notpenetrate the yarn a'sufiicient distance topermitVcontact of the Vlatter with the teeth of detector 36 and as the detector43 is moved 'forwardly by the continued advancing movement of thedetector the bridged portion 45 will move the adjacent part of thedetector 36'forwardly. Inasmuch as spring 41 lies'between the bridgeandthe lug 46 the latter will become a pivot point about which theVdetector 36 will be moved to some s uch a position as indicated indotted lines in Fig. 1. This'angular `movement on the part of thedetector 36 causes a corresponding Vright hand oscilla tion of thecontroller 50, causing` the end 54 of the latter to pass under the outerend of the actuator llever 21 asindicated in dott-ed lines in Fig. 1.Downward movement of the actuator will therefore be resisted and inldication of weft exhaustion will be communicated to the magazine asdescribed hereinbefore. Y p y On the subsequent transfer the stud 18will be moved forwardly to engage the link 49 and both detectors will bemoved out of the path of the incoming bobbin, this move-vr ment on'th-epart of the wedged detector being accomplished without angular movementon the part of the angularly movable member 36because of the fact thatthe end 48 lies between the pivot lug 33 and the spring 41. f

From the foregoing it will be seen that 1 have provided a very lightweft detector Vhaving yarn penetrating and yarn impinging elements bothof which areheld in normal yarn engaging position by a single Sli-,atsuch, a point aswill prevent indicating movement of theilatter `on theVwithdrawing movement... tpwfilligalso be noted that `the controller'torgthe actuator lever is very light andl is positioned:J by the springll1 through the vU;-shap.edv connector 51.-

lllavingihus described lmyvinvention,` it will beV appa-rent thatchanges andinoditications may be Amade therein by those sl-Iilled in theart without departingl from the spirit and scope of the invention, andvI do not wish to be limited to the details herein disclosed, but whatlclaim. is:

l. In a weft detector tor looms, a station` ary support, anangularlymovable yarn impinging detector slldably mounted on. the

support and having a right line sliding motion with respect to thesupport when 1n contact with sufiicient weft and having an angularmotion with respect to the support when presented to an insuliicientsupply lot wett, resilient means holding the'detector in normalposition,and a second detector having a yarn penetrating part extending beyondthe yarn impinging detector to enter a su'ti'icient supply of weft, saiddetectors being connected together, said second detector when inengagement with insutlicient yarn moving the first detector before thesame engages the yarn to move Ysaid tirst detector angularly and theresilient means acting to give the impinging the detector an angular'motion.

' 2. ln a wett detector for looms, a stationary support, an angularlymovable yarn im- Y pinging detector slidably mounted on the support andhaving a right line sliding motion with respect to the support when incontact with suiiicient weft and having an angular motion with respectto the support when presented to an insuliicient supply ot weit,resilient means holding the detector in normal position, a seconddetector having a yarn penetrating part extending beyond the yarnengaging surface of the' impinging detector, and a connection betweenthe detectors lying between the yarn impinging detector and theresilient means to cause angular movement ot' the impinging member bythe action of the resilient means when the penetrating detector engagesa bobbin supplied with insutlicient weft.

3. In a weft detector for looms, a stationary support, a yarn impingingdetector slidably mounted on the support, means delining a pivotalconnection'between the detector and the support, said detector slidingtorwardly in the support without angular motion when in contact withsufficient weft, a second detector having a yarn penetrating `partextending beyond the yarn engaging surface ot theimpinging detectormeansdenning an; operative.V connection betWeenthe detectors, and resilientmeans' connected:w to

thelimpinging.detector at appointpbetween the pivot of thesame andtheoperative; connection between the detectors, said penetrating detectorwhen in. Contact with a bobbin with insufficient weft moving, theimpinging detector forwardly beforev thev same ,can`r en- 'gage theyarnon .the bobbin, the resilient means under these conditions causing,a-ngir lar movement of the impinging detector.

e. In .a weft detector for looms, a stationary support, a yarn impingingdetector slidably mounted on'the support, means. defining a pivotalconnection between the detector and thesupporh said detector. slidingforwardly in the support without angular motion when in contact withsuliicient weft, a secondl detector having a yarn penetrating partextending beyond the yarn engaging surface of the impinging detector,means delining an operative connection between the detectors, resilientmeans connected to the impinging detector at a point between the pivotof the same and the operative connection between the detectors, saidpenetrating detector when in contact with a bobbin with insuilicientweft moving the impinging detector forwardly before the same can engagethe yarn on the bobbin, the resilient means under 4these conditionscausing angular movement of the impinging detector, an actuator to electa change in the operation of the loom, and a controller pivoted on thesupportand having a part operatively connected to. the vangularlymovable detector and having another part to cooperate with theactuatorat the time of angular motion of the yarn impinging detector.

5. In a wett detector for looms, a stationary'support, a yarn impingingdetector slidably mounted on the support, means defining a pivotalconnection between the detector and the support, said detector slidingforwardly in the support without angular motion when in Contact withsufficient weft, a second detector having a yarn penetrating partextending beyond the yarn engaging surface ot the impinging detector,means defining an operative connect-ion between the detectors, resilientmeans connected to the impinging detector at a point between the pivotof the same and the operative connection between the detectors, saidpenetrating detect-or when in contact with a bobbin with insullicientwett moving the impinging detector forwardly before the same can engagethe yarn on the bobbin, the resilient means under these conditionscausing angular movementA of the impinging detector, an actuator toeffect a change in the operation of the loom, and a controller pivotedon the support and having a part operatively con- Inected'to theangularly movable detector and theyarn impinging detector, saidcontroller being` in contact with opposite sides of the angularlymovable detectorI to be moved positively by the latter, the resilientmeans servingtherebyto place the controller as well as the detectors innormal position.

6. In a weft detector for looms, a stationary support, an angularlymovable yarn impinging detector slidably mounted on the support andhaving a right line sliding m` tion with respect to the support when incontact with sn'llicient welt and having an angular motion with respecttothe support when presented to an insufficient supply of weft,resilient means holding the detector in normal position, a seconddetector having a vyarn penetrating partextending beyond theyarnengaging surface ofthe impinging detector, a connection `between thedetectors lying` between the yarn impinging detector and the resilientmeans to cause angular movement of the impinging member by the action ofthe resilient meansl whenthe penetrating detector engages av bobbinsupplied with insullicient weft, and lmeans operatively connected to oneof the detectors to'with-.

ARTHUR l?. PAINE.

